in japan, don't they use like 89 octane? isn't that like their highest? and if so, then the b16a1 would be based off of using 89 octane. so wouldn't it be smarter to use 89 octane for better gas milage and HP? what should i be using?

also is my 90 cr-x si a ef8?

 

if i'm not mistaken, they have octane ratings higher than 91-92 (which is our highest here) and (i think...) they can run higer compression engines there as oppsed to the US, thats why japanese engines have a lil more horsepower

 

I had heard that their 89 octane is comparabe to our 91 due to the detergents in our gas....I dunno if thats true

 

yeh...im interested in this too..is it ok to run 89 in a stock b16? will it ping?